Article Figures & Data
Figures
- Fig 1.
Flow chart depicts the basic processing steps of QDS used in the present study.
- Fig 2.
MTF with a line-wire phantom for the original image and 3 QDS-processed images.
- Fig 3.
Wiener spectra with a line-wire phantom for the original image and 3 QDS-processed images.
- Fig 4.
CTA without QDS with 120 kVp and 200 mAs (A) and Q08-processed CTA with 120 kVp and 150 mAs (B) from the superior view. For depiction of aneurysmal blebs on CTA at a concentration of 20 mg I/mL, the Q08-processed CTA at 120 kVp and 150 mAs (arrows) is superior to the CTA without QDS at 120 kVp and 200 mAs.
Tables
Mean objective measurements of CNR and mean qualitative image scoresa
kV mAs CTDIw CNR Image Quality Score 15 mg I/mL 20 mg I/mL 15 mg I/mL 20 mg I/mL Original Q08 Original Q08 Original Q08 Original Q08 100 150 23.9 9.2 ± 0.6 11.6 ± 1.0 11.8 ± 0.9 16.1 ± 2.5 2.00 ± 0.7 2.58 ± 0.8 2.25 ± 0.8 2.92 ± 0.8 200 31.8 10.9 ± 1.7 14.3 ± 2.8b 13.8 ± 2.2 19.2 ± 3.6 2.17 ± 0.7 2.50 ± 1.0 3.17 ± 0.8 3.58 ± 0.7b 250 39.8 12.0 ± 2.1 16.1 ± 2.6b 16.0 ± 1.0 21.8 ± 1.4b 2.58 ± 0.7 3.00 ± 0.4b 3.42 ± 0.5 3.92 ± 0.7b 120 100 24.0 8.7 ± 1.4 11.3 ± 0.7 11.3 ± 1.1 14.9 ± 1.6 1.83 ± 0.7 2.40 ± 0.5 2.17 ± 0.9 2.42 ± 1.0 150 36.0 10.2 ± 1.0 14.2 ± 1.4b 14.8 ± 1.2 21.8 ± 1.8b 2.33 ± 0.8 2.75 ± 0.6 2.83 ± 0.7 3.50 ± 0.5b 200 48.0 11.5 ± 2.0c 18.4 ± 2.3b 17.3 ± 1.7c 22.7 ± 2.3b 2.50 ± 1.1c 3.08 ± 0.8b 3.12 ± 0.7c 3.83 ± 0.8b 135 100 30.7 9.80 ± 1.6 13.3 ± 0.9 12.3 ± 1.9 16.5 ± 1.6 1.67 ± 0.7 2.00 ± 0.7 2.58 ± 1.0 3.00 ± 1.0 -
a Data are the mean ± SD.
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b CTA with QDS were significantly superior to the standard CTA (120 kVp and 200 mAs) with a P value < .05 (Wilcoxon signed rank test).
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c Standard CTA.
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